cve/2020/CVE-2020-26256.md

### [CVE-2020-26256](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26256)
![](https://img.shields.io/static/v1?label=Product&message=fast-csv&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-400%20Uncontrolled%20Resource%20Consumption&color=brighgreen)

### Description

Fast-csv is an npm package for parsing and formatting CSVs or any other delimited value file in node. In fast-cvs before version 4.3.6 there is a possible ReDoS vulnerability (Regular Expression Denial of Service) when using ignoreEmpty option when parsing. This has been patched in `v4.3.6` You will only be affected by this if you use the `ignoreEmpty` parsing option. If you do use this option it is recommended that you upgrade to the latest version `v4.3.6` This vulnerability was found using a CodeQL query which identified `EMPTY_ROW_REGEXP` regular expression as vulnerable.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/engn33r/awesome-redos-security
- https://github.com/ossf-cve-benchmark/CVE-2020-26256